Elevator lock



March 7, 1950 H. A. FLINT ETAL 2,499,43l

ELEVATOR LOCK Filed Oct. 4, 1947 2 Sheets-Sheet 1 ATTORNEY March 7, 1950H. A. FLINT ETAL. 2,499,481

ELEVATOR LOCK Filed Oct. 4, 1947 2 Sheets-Sheet 2 Fly. 4

Fig. 3

AMVMQ L flji Gttotneg its swinging end. The

Patented Mar. 7, 1950 ELEVATOR LOCK Harold A. Flint, San Francisco, andCharles F. Lantz, Oakland, Calif.

Application October 4, 1947, Serial No. 777,978

This invention relates to safety devices for elevators, and has for itsprincipal object the provision of an elevator lock having the dualfunction of preventing operation of the elevator while the gate is inthe open position, and preventing the'opening of the gate while theelevator is at other than the floor level.

We accomplish the above by means of the mechanism described in thefollowing specification and illustrated in the accompanying drawingsforming a part hereof, and in which Figure l is a front elevation of thelocking mechanism with the housing cover removed.

Figure 2 is a side elevation, partly in section, as seen from line 2-2of Figure 1.

Figure 3 is an elevation similar to Figure 2 as seen from line 3-3 ofFigure 1.

Figure 4 is a fragmentary detail showing the device as applied to anelevator and shaft.

Referring to the drawing in detail, a rectangular housing 5 has amounting plate 6, spaced apart from the back wall 1 thereof, for aportion of its length, to form a slot 8, therewith. Rectangular openings9 and ill, in the wall 1 communicate with the slot 8.

Pivotally mounted by shaft H, in the upper end of the housing 5, is alatch l2 adapted to be operated by an arm l3 fixedly mounted on theexterior extending portion of the shaft H. The arm !3 is provided with aroller 14 mounted at latch I2 is adapted to swing from a gate engagingposition as shown in solid lines on Figure 3, to the gate releasingposition as shown in phantom.

Also pivotally mounted within on a shaft i4, is a double latch l5 whichhas, secured to one side thereof, a mercury switch [6 wired to aterminal block I! located on the back wall 1 near the lower end thereof.Upon installation of the safety device, wires are brought through anopening I8 in the bottom of the housing 5, and secured to the terminalblock l1, putting the switch [3 in one side of the power circuit to theelevator motor.

The double latch I5 is adapted to swing from a switch closing position,as shown in solid lines the housing 5,

on Figure 2, to a switch opening position as shown in phantom.

One of the safety devices is installed on the inner wall IQ of theelevator shaft, at each floor, as indicated on Figure 4. The elevator 20is pro vided with a cam 2| adapted to engage the roller Mand swing thearm l3 to open the latch I2 as shown in phantom on Figure 3.

The entrance to the elevator at each floor is 7 Claims. (Cl. 187-31) andan electric gate eng fging the power; circuit of an protected by a gate22 fitted with a bar 23 adapted to enter the slot 8. These gates arealways locked by the engagement of the bar 23 with the latch i2, asshown on Figure 3, and can only be re leased when the elevator is at theparticular floor, by the action of the cam 2|, as shown on Figure 4 Theupper edge of the chamfered as at 24, and the top edge of the back wall1 extends forwardly and upwardly to form a flange 25, both contributingto the easy entry of the bar 23 into the slot 8.

Referring to Figure 2, it will be seen that open ing of the gate 22 willcause the bar 23 to engage the latch l5, at its upper hook 2E, and swingit to the position shown in phantom, tripping the mercury switch 16 andbreaking the power circuit to the elevator. With the switch H5 in thisposition, operation of the elevator is impossible. When the gate isclosed, the bar 23 engages the latch H3 at its lower hock El, andreturns it to the switch closing position, allowin theelevator to be setin motion. An opening 28 in the mounting plate 6 provides clearance forthe latches I2 and E5.

The housing 5 is normally closed by means of a sheet metal cover, whichhas been omitted on the drawings in the interest of clearer delineationof the interior mechanism.

While we have disclosed a preferred embodiment of our invention, it willbe understood that modifications may be made Within the spirit and scopeof the appended claims.

We claim:

1. An elevator lock for use at a floor with an elevator and an elevatorgate comprising: a first gate engaging latch adapted to be actuated byan elevator adjacent the floor, a second gate engaging latch adapted tobe actuated by a gate, and an electric switch controlled by said secondgate engaging latch for breaking and making the power circuit of anelevator, said second gate engaging latch being provided with a pair ofspaced projections adapted to be successively engaged by opening andclosing movements of the gate.

2. An elevator lock for use at a floor with an elevator and an elevatorgate comprising: a first gate engaging latch adapted to be actuated byan elevator adjacent the floor, a second gate engaging latch adapted tobe actuated by a gate,

latch for breaking and making elevator, said second gate engagingfl'atch being provided with a pair of spaced projections adapted to besuccessively mounting plate 6 is I switch controlled by said second '3 ait engaged by opening and closing movements of the gate, said first gateengaging latch being adapted to permit opening the gate only when soactuated by an elevator.

3. An elevator lock for use at a floor with an elevator and an elevatorgate comprising: a first pivotally mounted gate engaging latch adaptedto be actuated by an elevator for looking a gate in closed positionexcept when so actuated, a second pivotally mounted gate engaging latchspaced from said first latch and adapted to open and close the powercircuit of said elevator by the opening and closing movements of thegate.

4. An elevator lock for use at a floor with elevator and an elevatorgate comprising first and second gate engaging latches adapted to be suecessively and independently actuated by the elevator and gaterespectively, said first latch being adapted to prevent opening of thegate except .Whenso actuated, said second latch being adapted to openand close the power circuit of the ele :Vator by the opening and closingmovements of the gate.

5,. An elevator lock for use at .a floor with an elevator and anelevator gate comprising a housp-illg having a slot extendinglongitudinally of the path of travel of such a gate, a first pivotallymounted gate engaging latch adapted to be actuated by an. elevator forlooking a gate in t closed position except when so actuated, a secondpivotally mounted gate engaging latch longitudinally spaced from saidfirst latch and adapted to open and close the power circuit of saidelevator by the opening and closing movements of the-gate.

6. An elevator lock for use at a floor with an elevator and an elevatorgate comprising a housing having .a slot extending longitudinally of thepath of travel of such .a gate, "a first pivotally mounted gateengaginglatch adapted to be actuated by an elevator for locking a gatein closed position except when so actuated, a second pivotally mountedgate engaging latch longitudinally spaced from said first latch andadapted to open and close the power circuit of said elevator by theopening and closing movements of the gate, a gate engaging tooth on saidfirst latch for movement into and out of said slot depending upon theposition of the elevator, a pair of longitudinally spaced projections onsaid second latch adapted to be successively engaged by the gate byopening and closing movements of the latter ior swinging said latch outof and into circuit closing position.

:7. An elevator lock for use at a floor with elevator and an elevatorgate comprising: a housing having .a ,slot extending longitudinally ofthe path of travel of such a gate, a first gate engaging latch adaptedto be actuated by an elevator for looking a gate in closed positionexcept when so actuated, a second gate engaging latch swingably mountedon said housing and spaced longitudinally from said first latch, spacedprojections on said second latch. adapted to be I successively enga edby opening and closing movements of said gate, and a switch secured tosaid second latch actuated by swinging movements of the latter foropening and closing the power circuit to said elevator.

HAROLD A. FLINT. CHARLES E. LANTZ.

REFERENCES CITED The .afollow'ing references are of record :in the fileof this patent:

UNITED STATES PATENTS Number Name Date 1,662,342 Schweig Mar. 13 .19282,075.292 Kaylor Mar. 30, 1937

